the ball under the arm makes sense, until you try to figure out how he landed, if it was him that was on the ground. My guess, he jumped into the garbage truck and had Molly use a body from the morgue ." I need your help, Molly." This is amazing btw

I really like your theory, but you need to consider how they would have got the body onto the sidewalk without John seeing, not to mention the troubles Molly would have gone through to find a body that looked almost exactly like Sherlock and would fit into his clothing; and besides, Sherlock would have had to clear the sidewalk to even land in the back of the truck. Just saying...